Armed police officers have closed the gates of Buckingham Palace as a precautionary measure following the incident at Westminster this afternoon, which is now being treated as a terrorist attack.
The Queen is currently in residence at Buckingham Palace with the Royal Standard flying on the roof.
There will be no plans for Her Majesty to leave London, and the precautionary measures are expected.
The UK Parliament is on lockdown following multiple incidents which includes a stabbing and car running into pedestrians.
At least one attacker has been shot dead by armed police.
The House of Commons and House of Lords has been suspended for the day – the first time since 2005.
Witnesses have spoken of hearing four separate gunshots.
The Leader of the House of Commons, David Lidington has confirmed that a police officer has been stabbed inside the grounds of the Parliamentary estate.
There are also reports that a car has been involved in a collision with pedestrians on Westminster Bridge.
Reuters are reporting that at least 12 people were struck by the car and were knocked onto the road outside of Big Ben.
The Prime Minister, Theresa May, was ushered into a ministerial car when shots were fired.
Transport for London has said that the Westminster underground system has been closed following a police request.